Tellurite resistance protein, TehA. Encoded in an operon with the gene for a tellurite S-adenosylmethionine-dependent methyl transferase. Together they confer tellurite resistance (Moraes and Reithmeier 2012).

Tellurite resistance protein TehA homologue. An anion channel involved in tellurite resistance. A quasi-symmetrical homotrimer in which each subunit has 10 TMSs and forms a channel. The crystal structure is known at 1.2 A resolution (Chen et al. 2010). The helices are arranged from helical hairpin pairs to form a central 5-helix transmembrane pore that is gated by a conserved phenylalanine residue. Gating is controlled by kinase activation. Selectivity for various anions may be a function of the energetic cost of ion dehydration (Chen et al. 2010).

The sulfite efflux (sulfite sensitivity) protein, SSU1. Expression is controlled by the FZF1-4 transcriptional activator; only free sulfite (not complexed sulfite) is exported (Park and Bakalinsky, 2000). Can also export nitrite and nitrate (Cabrera et al. 2014). SSU1 has a putative 10 TMS topology in a (S-L)5 arrangement where S= a small putative TMS and L= a large TMS.